CN106513616B - A kind of wide thickness plate continuous casting machine dry type method for capping - Google Patents
A kind of wide thickness plate continuous casting machine dry type method for capping Download PDFInfo
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- CN106513616B CN106513616B CN201610872294.6A CN201610872294A CN106513616B CN 106513616 B CN106513616 B CN 106513616B CN 201610872294 A CN201610872294 A CN 201610872294A CN 106513616 B CN106513616 B CN 106513616B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
- B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
A kind of wide thickness plate continuous casting machine dry type method for capping, belongs to continuous casting process technical field.Specific steps and parameter is as follows, falling-rate period：Tonnage is surveyed according to middle packet, practical liquid level is measured with reference to middle packet, reduces pulling rate to 0.25m/min；In the Low and Constant Velocity operation phase：According to middle packet tonnage and practical measurement liquid level, in the middle in packet during liquid steel level depth 100mm 300mm, stopper is closed, meanwhile, pulling rate is reduced to 0.15 0.2m/min, keeps low speed operation；In speed-raising process：After base tail pulls out crystallizer, pulling rate is carried to target pull rate.The advantage is that " do not consume slag, do not drag for slag, the control of low speed weak cold " realizes and tail base quality is effectively improved, improve tail base flaw detection qualification rate, reduce tail base waste product resection, improve recovery rate of iron.
Description
Technical field
The invention belongs to continuous casting process technical field, more particularly to a kind of wide thickness plate continuous casting machine dry type method for capping.Especially
It is to be related to a kind of continuous casting to pour the technology that binds eventually.
Background technology
The Market Situation of steel industry continued downturn is faced, eyes are inside, practice hard internal strength, and cost efficiency becomes major generous
Plate enterprise the only way.It is innovated by technology, continues to optimize production technology, improved continuous casting of metals recovery rate, be a kind of drop
The important means of this synergy.
Traditional wide thickness plate continuous casting closed-top technology takes method for capping of fetching water, and adopts this method carry out capping operation, tail
Base is of poor quality, the defects of more serious center segregation, central pipe, middle crack are easily generated inside tail base, such to lack
The problems such as being trapped in follow-up rolling process and also be difficult to eliminate, therefore the performance of steel plate can be seriously affected, steel plate inspection is caused not conform to.
If ensureing the quality of steel plate, need to sentence there will be the excision of the tail base of defect in practical continuous casting production process useless, cause
Significant wastage.
The report of related conticaster closed-top technology technical aspect having disclosed is less, and CN103878333A discloses one kind
The end for reducing medium slab caster mold copper plate wear pours method for capping, this patent mainly reduces continuous medium plate casting machine and ties
The abrasion of brilliant device copper coin provides a kind of end and pours method for capping, and there is no solve wide thickness plate continuous casting tail base quality, flaw detection qualification rate
Low, recovery rate of iron it is low problem.
Invention content
The purpose of the present invention is to provide a kind of wide thickness plate continuous casting machine dry type method for capping, solve wide thickness plate continuous casting tail
The problem of base is of poor quality, flaw detection qualification rate is low, recovery rate of iron is low.Its principle is by " not consuming slag, not dragging for slag, do not shut down, low
The technical solution of fast weak cold control " realizes that wide thickness plate continuous casting machine binds purpose.
A kind of wide thickness plate continuous casting machine dry type method for capping, specific steps and parameter are as follows：
1st, falling-rate period：When pouring time end, big packet stops after pouring, and tonnage is surveyed according to middle packet, and practical liquid is measured with reference to middle packet
Face, the acceleration of 0.05m/min is reduced according to every 20s reduces pulling rate, 0.25m/min is reduced to, during pulling rate is reduced
Slag is not consumed, does not drag for slag, normally adds slag, keeps black slag operation；
2nd, the Low and Constant Velocity operation phase：After pulling rate is down to 0.25m/min, liquid level is measured according to middle packet tonnage and reality, when
In middle packet during liquid steel level depth 100mm-300mm, stopper is closed, meanwhile, pulling rate is reduced to 0.15-0.2m/min, is kept
Low speed is run, until base tail goes out mouth under crystallizer, low pulling rate run time 4-5min, this stage does not continue to plus slag, but not
Fishing slag operation is carried out, covering slag is run together in company with tail base；
3rd, raise speed process：Base tail pull out crystallizer after, according to every 20-30s carry 0.05-0.1m/min acceleration raise speed to
0.5‐0.6m/min；The acceleration lifting that 0.1m/min is then carried according to every 30s is fast to target pull rate.Low pulling rate weak cold control will
It asks, after pulling rate is reduced to 0.25m/min, strand secondary cooling pattern uses tail base weak cold pattern, intensity of cooling specific water control
System is in 0.3-0.5L/kg.
The advantage of the invention is that：
(1) uniform reduction of speed, packet liquid level stabilizing declines in guarantee, and crystallizer flow field is stablized；
(2) it is whole to keep normally adding slag, slag is not consumed, does not drag for slag, avoids liquid level being caused to crust because tail base top heat dissipation is too fast,
So as to cause that accident is emitted on molten steel；
(3) the low pulling rate operation of constant speed, it is ensured that run time of the tail base in crystallizer is more than 4min, and tail base is for a long time
Natural shrinking is realized in natural cooling process, tail base internal soundness is effectively improved；
(4) closed-top technology of fetching water of abandoning tradition completely, takes dry type to bind secondary weak cold mode, improves tail base surface
Quality；
(5) present invention can not only be reduced tail base resection to 800mm, but also can carry tail base flaw detection qualification rate
Up to more than 99%.
Description of the drawings
Fig. 1 is technical solution of the present invention schematic diagram.
Specific embodiment
Embodiment 1
The method that certain steel mill employs 250mm* (1800-2400) mm medium carbon low alloy steel continuous casting steel billets the present invention, is poured
Secondary end, big packet stop after pouring, and liquid steel level measures in centering packet, with reference to middle packet tonnage, remaining molten steel amount 18t in packet in the middle
When, start uniformly to reduce pulling rate, 0.25m/min is reduced to by target pull rate 0.95m/min；Remaining molten steel amount 4t in packet in the middle
When, it closes stopper and stops cast, while pulling rate is reduced to 0.15m/min, remain a constant speed operation, this stage no longer adds slag, but
It is without dragging for slag operation；When mouth under tail base is run to crystallizer, improve 0.05m/min acceleration according to every 30s and uniformly carry
Speed when pulling rate reaches 0.5m/min, improves 0.1m/min acceleration according to every 20s and uniformly raises speed to target pull rate 1.2m/
min.Tail base weak cold pattern, intensity of cooling 0.5L/kg.Tail base low multiple quality is preferable, at the 800mm of tail portion, no middle crack,
No shrinkage cavity, center segregation grading C2.0, surface quality of continuously cast slab is preferably without finding surface quality defect, the steel plate after rolling
Surface quality defect is not found in surface of steel plate, steel plate is through carrying out flaw detection qualification.Embodiment 2
The method that certain steel mill employs 180mm* (1600-1800) mm medium carbon low alloy steel continuous casting steel billets the present invention, is poured
Secondary end, big packet stop after pouring, and liquid steel level measures in centering packet, with reference to middle packet tonnage, remaining molten steel amount 16t in packet in the middle
When, start uniformly to reduce pulling rate, 0.25m/min is reduced to by target pull rate 1.1m/min；In the middle in packet during residue molten steel amount 3t,
It closes stopper and stops cast, while pulling rate is reduced to 0.2m/min, remain a constant speed operation, this stage no longer adds slag, but not
Carry out fishing slag operation；When mouth under tail base is run to crystallizer, improve 0.05m/min acceleration according to every 20s and uniformly raise speed, when
When pulling rate reaches 0.5m/min, improve 0.1m/min acceleration according to every 20s and uniformly raise speed to target pull rate 1.2m/min.Tail base
Weak cold pattern, intensity of cooling 0.3L/kg.Tail base low multiple quality is preferable, at the 700mm of tail portion, no middle crack, without shrinkage cavity,
Center segregation grading C2.0, surface quality of continuously cast slab is preferably without finding surface quality defect, and steel plate is not also in steel after rolling
Plate surface finds surface quality defect, and steel plate is through carrying out flaw detection qualification.
Claims (1)
1. a kind of wide thickness plate continuous casting machine dry type method for capping, which is characterized in that specific steps and parameter is as follows：
1) falling-rate period：When pouring time end, big packet stops after pouring, and tonnage is surveyed according to middle packet, measures practical liquid level with reference to middle packet, presses
The acceleration of 0.05m/min is reduced according to every 20s reduces pulling rate, is reduced to 0.25m/min；
2) the Low and Constant Velocity operation phase：After pulling rate is down to 0.25m/min, according to middle packet tonnage and practical measurement liquid level, wrap in the middle
During interior liquid steel level depth 100mm-300mm, stopper is closed, meanwhile, pulling rate is reduced to 0.15-0.2m/min, keeps low speed
Operation, until base tail goes out mouth under crystallizer, low pulling rate run time 4-5min, this stage does not continue to plus slag, but without
Slag operation is dragged for, covering slag is run together in company with tail base；
3) raise speed process：After base tail pulls out crystallizer, the acceleration that 0.05-0.1m/min is carried according to every 20-30s raises speed to 0.5-
0.6m/min；The acceleration lifting that 0.1m/min is then carried according to every 30s is fast to target pull rate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610872294.6A CN106513616B (en) | 2016-09-30 | 2016-09-30 | A kind of wide thickness plate continuous casting machine dry type method for capping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610872294.6A CN106513616B (en) | 2016-09-30 | 2016-09-30 | A kind of wide thickness plate continuous casting machine dry type method for capping |
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| Publication Number | Publication Date |
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| CN106513616A CN106513616A (en) | 2017-03-22 |
| CN106513616B true CN106513616B (en) | 2018-07-06 |
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| CN201610872294.6A Active CN106513616B (en) | 2016-09-30 | 2016-09-30 | A kind of wide thickness plate continuous casting machine dry type method for capping |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014106B (en) * | 2017-06-12 | 2020-07-21 | 上海梅山钢铁股份有限公司 | Capping method for reducing finishing amount of slab continuous casting tail blank and improving temperature of blank tail |
| CN109351930B (en) * | 2018-11-09 | 2021-02-23 | 鞍钢股份有限公司 | Tail billet capping method for rectangular billet continuous casting ultra-low carbon steel |
| CN110681838B (en) * | 2019-11-01 | 2021-07-06 | 河北工业职业技术学院 | High-pulling-speed non-stop water-free capping method for wide and thick plate continuous casting machine |
| CN111822665B (en) * | 2020-07-25 | 2021-12-21 | 莱芜钢铁集团银山型钢有限公司 | Argon blowing control method and argon control device for continuous casting tundish breathable upper nozzle pocket block |
| CN112893825A (en) * | 2021-01-20 | 2021-06-04 | 江苏省沙钢钢铁研究院有限公司 | Stepped tundish and casting control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053895A (en) * | 2007-05-31 | 2007-10-17 | 武汉钢铁(集团)公司 | Flat blank continuous casting closed-top technology for preventing steel liquid roof-falling |
| CN103586433A (en) * | 2013-11-04 | 2014-02-19 | 南京钢铁股份有限公司 | Method for increasing flaw detection yield of continuous casting sheet head billet and tail billet |
| CN105798252A (en) * | 2016-05-17 | 2016-07-27 | 湖南华菱涟源钢铁有限公司 | Continuous casting stop-casting blank tail discharge and top sealing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4678592B2 (en) * | 2005-10-21 | 2011-04-27 | 日立金属株式会社 | Continuous casting equipment |
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2016
- 2016-09-30 CN CN201610872294.6A patent/CN106513616B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053895A (en) * | 2007-05-31 | 2007-10-17 | 武汉钢铁(集团)公司 | Flat blank continuous casting closed-top technology for preventing steel liquid roof-falling |
| CN103586433A (en) * | 2013-11-04 | 2014-02-19 | 南京钢铁股份有限公司 | Method for increasing flaw detection yield of continuous casting sheet head billet and tail billet |
| CN105798252A (en) * | 2016-05-17 | 2016-07-27 | 湖南华菱涟源钢铁有限公司 | Continuous casting stop-casting blank tail discharge and top sealing method |
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| CN106513616A (en) | 2017-03-22 |
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Effective date of registration: 20190325 Address after: 063200 Iron and Steel Power Park, Caofeidian Industrial Zone, Tangshan City, Hebei Province Patentee after: Shougang Jingtang Steel & Iron United Co., Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |